Do not believe the websites which all have this wrong...This pool is not heated and is closed seasonally. BUT they do allow use of the heated pool at Paris next door if you wanna hike.
Bally's pool is NOT FAMILY FRIENDLY, adult oriented, and by that I mean middle-aged, working class folks. Bad DJ spin on the weekends. Beat up, dirty lounge chairs surround this classic-style pool with something rare for Las Vegas, a deep end. Surrounding grounds are gray and boring, often disorganized and cluttered with trash people leave behind. It is understaffed and often they close the deep end so they don't have to pay extra life guards.
Nothing special here. Typical for Vegas, drinks at the pool are pricey, similar prices to the Wynn pool which was surprising.
I very much relish my relaxing pool time when visiting Vegas. This is not the place for that. We didn't enjoy ourselves and left early.